void WriteIndices(Mesh assimpMesh, ModelData.MeshPart meshPart, ModelData.IndexBuffer indexBuffer)
{
// Write all indices
var indices = assimpMesh.GetIntIndices();
indexBuffer.Count = indices.Length;
meshPart.IndexBufferRange.Count = indices.Length;
if (meshPart.VertexBufferRange.Count < 65536)
{
// Write only short indices if count is less than the size of a short
indexBuffer.Buffer = new byte[indices.Length * 2];
using (var indexStream = DataStream.Create(indexBuffer.Buffer, true, true))
foreach (int index in indices)
{
indexStream.Write((ushort)index);
}
}
else
{
// Otherwise, use full 32-bit precision to store indices
indexBuffer.Buffer = new byte[indices.Length * 4];
using (var indexStream = DataStream.Create(indexBuffer.Buffer, true, true))
indexStream.WriteRange(indices);
}
// Update the MaximumBufferSizeInBytes needed to load this model
if (indexBuffer.Buffer.Length > model.MaximumBufferSizeInBytes)
{
model.MaximumBufferSizeInBytes = indexBuffer.Buffer.Length;
}
}
void WriteBarycentricVertices(Mesh assimpMesh, ModelData.MeshPart meshPart, ModelData.VertexBuffer vertexBuffer, int vertexBufferElementSize)
{
//System.Diagnostics.Debugger.Launch();
int[] indices = assimpMesh.GetIntIndices();
int indexCount = indices.Length;
// Write all vertices
meshPart.VertexBufferRange.Count = indexCount;
vertexBuffer.Count = indexCount;
vertexBuffer.Buffer = new byte[vertexBufferElementSize * indexCount];
// Update the MaximumBufferSizeInBytes needed to load this model
if (vertexBuffer.Buffer.Length > model.MaximumBufferSizeInBytes)
{
model.MaximumBufferSizeInBytes = vertexBuffer.Buffer.Length;
}
var vertexStream = DataStream.Create(vertexBuffer.Buffer, true, true);
boundingPoints = new Vector3[indexCount];
var newVertices = new VertexPositionNormalTexture[indices.Length];
for (int i = 0; i < indexCount; i++)
{
try
{
int i0 = indices[i];
var v0 = assimpMesh.Vertices[i0];
var v = new Vector3(v0.X, v0.Y, v0.Z);
var n0 = assimpMesh.Normals[i0];
var n = new Vector3(n0.X, n0.Y, n0.Z);
var uv = assimpMesh.GetTextureCoords(0)[i0];
var t = new Vector2(uv.X, uv.Y);
// Store bounding points for BoundingSphere pre-calculation
boundingPoints[currentBoundingPointIndex++] = v;
newVertices[i0] = new VertexPositionNormalTexture(v, n, t);
}
catch (Exception ex)
{
Debug.WriteLine("!" + ex);
}
}
var barycentricVertices = ModelEditor.ConvertToBarycentricEdgeNormalVertices(newVertices, indices);
foreach (var vertex in barycentricVertices)
{
vertexStream.Write(vertex.Position);
vertexStream.Write(vertex.Normal);
vertexStream.Write(vertex.TextureUV);
vertexStream.Write(vertex.Barycentric);
}
vertexStream.Dispose();
}
private void Construct(Assimp.Mesh mesh, Action <Vector3, Vector3, Vector2> appendVertex, Action <Int3> appendIndex, ref int offset)
{
if (mesh.HasFaces && mesh.HasVertices)
{
for (int i = 0; i < mesh.VertexCount; i++)
{
Vector3D mp = mesh.Vertices[i];
Vector3 p = new Vector3(mp.X, mp.Y, mp.Z);
Vector3D mn = mesh.Normals[i];
Vector3 n = new Vector3(mn.X, mn.Y, mn.Z);
appendVertex(p, n, Vector2.Zero);
}
int[] inds = mesh.GetIntIndices();
for (int i = 0; i < inds.Length / 3; i++)
{
appendIndex(new Int3(inds[i * 3 + offset], inds[i * 3 + offset + 1], inds[i * 3 + offset + 2]));
}
offset += mesh.VertexCount;
}
}
private ModelData.MeshPart Process(ModelData.Mesh mesh, Assimp.Mesh assimpMesh)
{
var meshPart = new ModelData.MeshPart()
{
MaterialIndex = assimpMesh.MaterialIndex,
VertexBufferRange = new ModelData.BufferRange()
{
Slot = mesh.VertexBuffers.Count
},
IndexBufferRange = new ModelData.BufferRange()
{
Slot = mesh.IndexBuffers.Count
}
};
var vertexBuffer = new ModelData.VertexBuffer()
{
Layout = new List <VertexElement>()
};
mesh.VertexBuffers.Add(vertexBuffer);
var indexBuffer = new ModelData.IndexBuffer();
mesh.IndexBuffers.Add(indexBuffer);
var layout = vertexBuffer.Layout;
int vertexBufferElementSize = 0;
// Add position
layout.Add(VertexElement.PositionTransformed(Format.R32G32B32_Float, 0));
vertexBufferElementSize += Utilities.SizeOf <SharpDX.Vector3>();
// Add normals
if (assimpMesh.HasNormals)
{
layout.Add(VertexElement.Normal(0, Format.R32G32B32_Float, vertexBufferElementSize));
vertexBufferElementSize += Utilities.SizeOf <SharpDX.Vector3>();
}
// Add colors
if (assimpMesh.VertexColorChannelCount > 0)
{
for (int localIndex = 0, i = 0; i < assimpMesh.VertexColorChannelCount; i++)
{
if (assimpMesh.HasVertexColors(i))
{
layout.Add(VertexElement.Color(localIndex, Format.R32G32B32A32_Float, vertexBufferElementSize));
vertexBufferElementSize += Utilities.SizeOf <SharpDX.Color4>();
localIndex++;
}
}
}
// Add textures
if (assimpMesh.TextureCoordsChannelCount > 0)
{
for (int localIndex = 0, i = 0; i < assimpMesh.TextureCoordsChannelCount; i++)
{
if (assimpMesh.HasTextureCoords(i))
{
var uvCount = assimpMesh.GetUVComponentCount(i);
if (uvCount == 2)
{
layout.Add(VertexElement.TextureCoordinate(localIndex, Format.R32G32_Float, vertexBufferElementSize));
vertexBufferElementSize += Utilities.SizeOf <SharpDX.Vector2>();
}
else if (uvCount == 3)
{
layout.Add(VertexElement.TextureCoordinate(localIndex, Format.R32G32B32_Float, vertexBufferElementSize));
vertexBufferElementSize += Utilities.SizeOf <SharpDX.Vector3>();
}
else
{
throw new InvalidOperationException("Unexpected uv count");
}
localIndex++;
}
}
}
// Add tangent / bitangent
if (assimpMesh.HasTangentBasis)
{
layout.Add(VertexElement.Tangent(Format.R32G32B32_Float, vertexBufferElementSize));
vertexBufferElementSize += Utilities.SizeOf <SharpDX.Vector3>();
layout.Add(VertexElement.BiTangent(Format.R32G32B32_Float, vertexBufferElementSize));
vertexBufferElementSize += Utilities.SizeOf <SharpDX.Vector3>();
}
// Extract Skinning Indices / Weights
bool hasWeights = false;
var skinningCount = new int[assimpMesh.VertexCount];
var skinningIndices = new Int4[assimpMesh.VertexCount];
var skinningWeights = new Vector4[assimpMesh.VertexCount];
if (assimpMesh.HasBones)
{
meshPart.BoneOffsetMatrices = new Matrix[assimpMesh.BoneCount];
for (int i = 0; i < assimpMesh.Bones.Length; i++)
{
var bone = assimpMesh.Bones[i];
meshPart.BoneOffsetMatrices[i] = ConvertMatrix(bone.OffsetMatrix);
if (bone.HasVertexWeights)
{
var boneNode = scene.RootNode.FindNode(bone.Name);
var boneIndex = skinnedBones[boneNode];
for (int j = 0; j < bone.VertexWeightCount; j++)
{
var weights = bone.VertexWeights[j];
var vertexSkinningCount = skinningCount[weights.VertexID];
skinningIndices[weights.VertexID][vertexSkinningCount] = boneIndex;
skinningWeights[weights.VertexID][vertexSkinningCount] = weights.Weight;
skinningCount[weights.VertexID] = ++vertexSkinningCount;
}
hasWeights = true;
}
}
if (hasWeights)
{
layout.Add(VertexElement.BlendIndices(Format.R16G16B16A16_SInt, vertexBufferElementSize));
vertexBufferElementSize += Utilities.SizeOf <SharpDX.Int4>();
layout.Add(VertexElement.BlendWeights(Format.R32G32B32A32_Float, vertexBufferElementSize));
vertexBufferElementSize += Utilities.SizeOf <SharpDX.Vector4>();
}
}
// Write all vertices
meshPart.VertexBufferRange.Count = assimpMesh.VertexCount;
vertexBuffer.Count = assimpMesh.VertexCount;
vertexBuffer.Buffer = new byte[vertexBufferElementSize * assimpMesh.VertexCount];
// Update the MaximumBufferSizeInBytes needed to load this model
if (vertexBuffer.Buffer.Length > model.MaximumBufferSizeInBytes)
{
model.MaximumBufferSizeInBytes = vertexBuffer.Buffer.Length;
}
var vertexStream = DataStream.Create(vertexBuffer.Buffer, true, true);
for (int i = 0; i < assimpMesh.VertexCount; i++)
{
var position = assimpMesh.Vertices[i];
vertexStream.Write(position);
// Store bounding points for BoundingSphere pre-calculation
boundingPoints[currentBoundingPointIndex++] = new Vector3(position.X, position.Y, position.Z);
// Add normals
if (assimpMesh.HasNormals)
{
vertexStream.Write(assimpMesh.Normals[i]);
}
// Add colors
if (assimpMesh.VertexColorChannelCount > 0)
{
for (int j = 0; j < assimpMesh.VertexColorChannelCount; j++)
{
if (assimpMesh.HasVertexColors(j))
{
vertexStream.Write(assimpMesh.GetVertexColors(j)[i]);
}
}
}
// Add textures
if (assimpMesh.TextureCoordsChannelCount > 0)
{
for (int j = 0; j < assimpMesh.TextureCoordsChannelCount; j++)
{
if (assimpMesh.HasTextureCoords(j))
{
var uvCount = assimpMesh.GetUVComponentCount(j);
var uv = assimpMesh.GetTextureCoords(j)[i];
if (uvCount == 2)
{
vertexStream.Write(new Vector2(uv.X, uv.Y));
}
else
{
vertexStream.Write(uv);
}
}
}
}
// Add tangent / bitangent
if (assimpMesh.HasTangentBasis)
{
vertexStream.Write(assimpMesh.Tangents[i]);
vertexStream.Write(assimpMesh.BiTangents[i]);
}
// Add Skinning Indices/Weights
if (assimpMesh.HasBones && hasWeights)
{
vertexStream.Write(skinningIndices[i]);
vertexStream.Write(skinningWeights[i]);
}
}
vertexStream.Dispose();
// Write all indices
var indices = assimpMesh.GetIntIndices();
indexBuffer.Count = indices.Length;
meshPart.IndexBufferRange.Count = indices.Length;
if (meshPart.VertexBufferRange.Count < 65536)
{
// Write only short indices if count is less than the size of a short
indexBuffer.Buffer = new byte[indices.Length * 2];
using (var indexStream = DataStream.Create(indexBuffer.Buffer, true, true))
foreach (int index in indices)
{
indexStream.Write((ushort)index);
}
}
else
{
// Otherwise, use full 32-bit precision to store indices
indexBuffer.Buffer = new byte[indices.Length * 4];
using (var indexStream = DataStream.Create(indexBuffer.Buffer, true, true))
indexStream.WriteRange(indices);
}
// Update the MaximumBufferSizeInBytes needed to load this model
if (indexBuffer.Buffer.Length > model.MaximumBufferSizeInBytes)
{
model.MaximumBufferSizeInBytes = indexBuffer.Buffer.Length;
}
return(meshPart);
}